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+====== obj.FilenameOnDisk ======
+===== Motivation =====
+This method can be used in scripted applications, for instance to store a result of a call to another method (e.g. [[prt.CreateSDM|PRT::CreateSDM]]) under a similar filename (see example below).
+===== Reference ('obj.Help('FilenameOnDisk')') =====
+<file> AFT::FilenameOnDisk  - returns the filename property
+ FORMAT:       filename = obj.FilenameOnDisk;
+ No input fields
+ Output fields:
+       filename    last used filename (on load or save)
+ TYPES: ALL</file>
+===== Usage example =====
+<code matlab obj_FilenameOnDisk_example.m>% loading a protocol
+prt = xff('*.prt');
+% creating an SDM with
+% - 240 volumes,
+% - a TR of 2000 msec, and
+% - no rest condition in the PRT
+sdm = prt.CreateSDM(struct('nvol', 240, 'prtr', 2000, 'rcond', []));
+% save under same filename with .sdm extension
+sdm.SaveAs(strrep(prt.FilenameOnDisk, '.prt', '.sdm'));</code>
+===== Usage notes =====
+The ''.FilenameOnDisk'' (property) method will return an **empty string for object that have not been load from/saved to disk**!